Grinding-mill



l (No Model.) 3 Sheets-Sheet l.

L. C. SPRINGER. H

GRINDING MILL.

No. 290,369. Patent-d Den. 18, 18.83..'

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GRINDING MILL.

Patented'DecJ 18, 1883.

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GRINDING MILL.

Patented Deo. 18

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LEWIS C. SPRINGER, OF ILMINGTN, DELAVARE.

GRINDlNe-MILL.

y SPECIFICATIONforming part of Letters Patent `No. 290,369, dated December 18, 1883.

Application filed J une 27, 1883. (No model.)

' To all whom t ntwy concern:

. ing drawings, which form a part of this speciication, and in which- Figure l is a perspective view of my improved grinding-mill. Fig. 2 is a vertical sectional View of the same. Fig. 3 is a horizontal sectional view of the same on line x m in Fig. 2. Fig. 4 is a similar view on line y jl/in Fig. 2. Fig. 5 is a cross-sectional view of the spindle, taken on linez e, Figs. l and 2. Fig. 6 is a partial vertical sectional view in a plane longitudinally of the bridge-tree; and Fig. 7 is a horizontal sectional view of the sleeve E, showing the corrugations of the plates on its internal surface.

Similar letters of reference indicate corresponding parts inall the figures.

My invention-has relation to improvementsv in grinding-mills; and it consists in the improved construction and combination of parts ofthe same, as hereinafter more fully described and claimed.

In the accompanying two sheets of drawings, A represents the bed-plate of the mill.

B represents metal posts or standards, bolted at their lower ends to the bed-plate, and at their upper ends to the sides of the cylindrical grinding-chamber C.

D represents the hopper, which is provided at its top with a suitable bearing, I, to receive the upper end of the spindle K, and is connected at its lower end by means .of a flangejoint to the top of a collar, E, on the top of the cylindrical grinding-chamber G,- the flange ofthe collar being recessed at K for the reception of gates F. The outer ends of the gates F are bent down at right angles-each gate being provided with an adj Listing-screw, G, passing through a slot or opening in the bent end of the gate, the point of the screw entering the side of the collar E.

regulate the amount of grain or other material which passes from the hopper into the cylindrical grinding-chamber C. A spiral spring, H, is placed around each of the screws G, between the bent end of the-gate, through which the screw passes, and the side of the collar, and serves to hold the gate open.

K represents the spindle, which is secured at its upper end in a bearing, I, the toe of the spindle resting in the socket or step J, which is vertically adjustable in the manner hereinafter described. A metal disk, L, is secured to the spindle by bolts passing through a collar, M, cast on its lower side. This disk supports the runner N, which is cast of steel. The grinding-plate O is also made of steel, and the grinding-plates are fastened (the runner to the disk L, and the stationary one to the disk forming the top of the grinding-chamber) by bolts N', passing through the disks and the grinding-plates. 4

The dress of the runner. (shown at Fig. 4) consists of a series of curved furrows, P, running from the central bushing of the runner to its periphery, each alternate quarter having a recess, Q, for the reception of the head of thel bolts N. The other alternate quarters have each a straight branch furrow, L,which intersects the curved leader at R, and extends from this point of contact to the periphery of the runner. The grinding-face of the grindingplate is dressed in a similar manner.

The serrated grinding-surface of the hopper D consists of a steel casing, S,which fits inside of the hopper, and is held in place by bolts T T. This serrated casing S is cast in sections, so that when one of the sections becomes worn it can be removed and replaced by an other without removing the entirecasing. The serrated grinding-surface of the collar E (shown at Fig. 7 also consists of a steel casing, U, cast in sections, and fastened to the inner surface of the collar by means of bolts V. A series of breaker-disks, W, are fastened upon the spindle, and extend from apointslightly abovethebottom of the collar E to a point opposite the top of the hopper. A collar, X, is bolted upon the spindle abovethe breaker-disks, and serves IOO to prevent all longitudinal motion of the said disks. The spindle may be made square, in which case the eyes of the disks IV are also made square, to fit the shape of the spindle; or the spindle may be made round, in which ease it has a feather, Y, consisting of a metal slip inserted longitudinally into the spindle and projectingtherefrom, so as to fit into a groove, Z, in the eye of each of the disks XV, as clearly shown in Fig. 5 ofthe drawings. The breakerdisks are adjusted upon the spindle in such a manner that their teeth break joints with each other, as shown in Fig. 5, where A' represents the teeth of the top breaker-disk, and B the teeth of the disk immediately below it.

C' represents wings, of leather or other suitable material, which are attached to the under side ofthe metal disk Lfor the purpose of sweepingthegroundmeal into the discharge-spoutD'.

E' represents a metal sleeve, which is provided with a flange, F', by which it is secured to the bed-plate A. The step J, (shown at Fig. 2,) which supports the toe of the spindle, is inserted into this sleeve, the bottom of the step resting upon a bridge-tree, G', which passes through the sleeve. Thebridge-tree G' is provided at each of its ends with a lighterscrew, H', so that by turning the screws H the spindle can be raised or lowered, so as to diminish or increase the distance between the grinding-surfaces of the mill-plates N and O. To the bottom of the cylindrical grindingchamberG is bolted a bearing, I', through which the spindle passes, and which acts as a brace for the lower part of the spindle.

K' represents a pulley-wheel attached to the end of a drive-shaft which is hung in suitable bearings, the said shaft having a bevelpinion, J', on its inner end, gearing into a bevel-pinion, J", on the spindle.

The grain or other material is put into the hopper, where it is partially broken between the surfaces of the breaker-disks and the serrated grinding-surfaces of the hopper and collar E. The grain is then fed to the grinding- 45 plates through the eye of the bed-plate O, and after being thoroughly ground falls to the bottom of the cylindrical grinding-chamber C, when' the wings C' sweep the ground mealinto the discharge-spout D. 5o

From the foregoing descripti on, taken in connection with the accompanying drawings, the operation of myimproved grinding-mill will readily be understood without requiring eX- tended explanation. 5 5

If it is desired to use the mill without the breaker attachment, the serrated inner surface of the hopper and the collar E can be readily removed by unscrewin g the bolts which hold the steel sections in position, and by re- 6o moving the collar Xfrom the spindle the breaker-disks IV can be readily removed from the Spindle.

Having thus described my invention, Ielaim and desire to secure by Letters Patent of the 65 United Statesl. In a grinding-mill, the combination ofthe flanged hopper D, flanged collar E, having recesses K', gates F, sliding in said recesses in the fiange of the collar,adj Listing-screws G, and 7o spiral springs I-I, encircling said screws, and adapted to hold the gates in an open position, substantial] y as and for the purpose shown and set forth.

2. The herein-described millstone dress, 75 consisting of the reversely-curved furrows l?, running from the eye of the stone to its periphery, and intersccted by straight branch furrows L', running from thepoint of contaetRto the periphery ofthe plate or stone. substantially 8o as and for the purpose shown and described.

In testimony that I claim the foregoing as my own I have hereunto affixed my signature in presence of two witnesses.

LEXVIS C. SPRINGER.

Witnesses: Isaac N. TAYLOR, ANDREW B. VHITE. 

